I have 4/8s, 9/16s, 5/8s, 11/16s, 6/8s, and one 13/16s. They all shave equally well. I am always amazed that the 4/8s can provide a full, close shave over my whole face including the dreaded chin and upper lip.

While my current favorite razors are a 6/8 Thiers-Issard Le Grelot and a 13/16 J. A. Henckels 72 1/2, I would be loath to give up any of my smaller razors. They also provide excellent shaves, albeit, with a slightly different feel. I enjoy having different brands, sizes, and grinds in the collection. The variety adds a little spice to my daily shaves.